the chinese come back to show what technological capability they have. show economic might and demonstrate to the world that they, too, can be tech knoll onlyicly advanced. they can use it as a stepping moon. >> we must be able to learn more with current technology than what we had the in '70s. >> some at nasa say china's mission could interfere with nasa's probe orbiting the meal. >> with the, the mission sent up in september is studying the exosphere, the environment around the moon and the dust on the surface of the moon. any disturbance of either of those environments could throw a monkey wrench into the satellite. the ro propellant as it makes its way down to the surface will put a lander on the surface, the propellant that slows down the environment will pollute the environment. the principal scientist is not happy. it presents another alternative, and that is we can study how quickly the propel ants dissipate out of the environment. >> it will be exciting to have anything on the moon after a long time. >> the show may be over on the website, faceb